Commodore 1541 Floppy Drive Hardware Failure Cheat Sheet |
||||||||
Commodore Diagnostician II Symptomatic Chart Diagnosing |
6502 | 6522 | 325302 | 901229 | LB311 | 592 | 9602 | 325572 |
Error LEB blinks on power up | x | x | ||||||
Searching with no red LED | x | x | ||||||
Drive fails to read | x | x | x | x | ||||
Fails to fomat | x | x | ||||||
Stepper motor does not step | x | x | ||||||
Will not save when drive heats up | x | x | ||||||
Lights stay on, motor runs continuously | x | x | ||||||
No LEDs on power up | Check power supply voltage, Check CR3, VR2, VR1, CR1 | |||||||
Drive motor runs continuously with no green LED | Check 5Volt on power supply | |||||||
Flashing light on and off | Check UC1, UD2 | |||||||
Message of ‘FILE NOT FOUND’ is displayed | Check alignment, defective disk | |||||||
Drive speed will not stabilize | Clean drive head w/ Alcohol, check alignment | |||||||
Display reads ERROR 21-29 (Disk Errors) | Checl PCB speed (LAG570 – for Newt. Drive) | |||||||
Write protect on ERROR #25 | Check WPS, UA1, Write Protect Switch, alignment | |||||||
Track 18 Display 21 read ERROR | Check alignment, UC2, UE6, check R/W head | |||||||
Will not load certain programs | Check alignment, track 0 stop |